Benning IT 110 User manual

Operating manual
Installation Tester
BENNING IT 110 / BENNING IT 120 B

2
1 Preface............................................................................................................................5
2 Safety and operational considerations........................................................................6
2.1 Warnings and notes.........................................................................................................6
2.2 Batteries...........................................................................................................................8
2.3 Charging ..........................................................................................................................9
2.4 Precautions on charging of new battery cells or cells unused
for a longer period............................................................................................................9
2.5 Standards applied..........................................................................................................10
3 Description of the BENNING IT 110/ BENNING IT 120 B ..........................................11
3.1 Front panel.....................................................................................................................11
3.2 Connector panel.............................................................................................................12
3.3 Back panel.....................................................................................................................12
3.4 Bottom view ...................................................................................................................13
3.5 Carrying the BENNING IT 110/ BENNING IT 120 B......................................................14
3.6 BENNING IT 110/ BENNING IT 120 B set and accessories..........................................14
3.6.1 Standard set...........................................................................................................14
3.6.2 Optional accessories..............................................................................................15
4 Operation of the BENNING IT 110/ BENNING IT 120 B.............................................16
4.1 Meaning of symbols and messages on the display of the
BENNING IT 110/ BENNING IT 120 B..........................................................................16
4.1.1 Online voltage and output terminal monitor...........................................................16
4.1.2 Messageeld–batterystatus ...............................................................................16
4.1.3 Messageeld–measurementwarnings/messages..............................................17
4.1.4 Resulteld .............................................................................................................18
4.1.5 Other messages.....................................................................................................18
4.1.6 Sound warnings.....................................................................................................18
4.1.7 Function and parameter line..................................................................................19
4.1.8 Selecting measurement function/sub-function.......................................................19
4.2 Setting measurement parameters and limits .................................................................19
4.3 Help menu......................................................................................................................19
4.4 Setup menu....................................................................................................................20
4.4.1 Supply system setup..............................................................................................20
4.4.2 Prospective short/fault current scaling factor adjustment ......................................20
4.4.3 Language selection................................................................................................21
4.4.4 Communication port settings (BENNING IT 120 B only) .......................................21
4.4.5 Activating/ deactivating the COMMANDER (switchable probe tip)........................21
4.4.6 Recalling original settings......................................................................................22
4.5 Display contrast adjustments.........................................................................................23
5 Measurements..............................................................................................................24
5.1 Insulation resistance......................................................................................................24
5.2 Resistance / continuity testing .......................................................................................25
5.2.1 LowΩresistancemeasurement .............................................................................25
5.2.2 Continuity...............................................................................................................27
5.3 Testing RCDs.................................................................................................................29
5.3.1 Limit contact voltage..............................................................................................29
5.3.2 Nominal differential trip-out current........................................................................29
5.3.3 Multiplier of nominal residual current.....................................................................29
5.3.4 RCD type and test current starting polarity............................................................29

3
5.3.5 Testing selective (time-delayed) RCDs..................................................................30
5.3.6 Contact voltage......................................................................................................30
5.3.7 Trip-out time...........................................................................................................32
5.3.8 Trip-out current ......................................................................................................33
5.3.9 Autotest..................................................................................................................34
5.4 Loop impedance and prospective short-circuit current (Zs/ Ik)......................................37
5.4.1 Loop impedance (loop resistance, Zl)....................................................................37
5.4.2 Loop impedance (Zsrcd)........................................................................................39
5.5 Line impedance and prospective short-circuit current ...................................................40
5.6 Phase rotation (phase sequence)..................................................................................41
5.7 Voltage and frequency...................................................................................................42
5.8 Testing the PE terminal..................................................................................................43
5.9 Resistance to earth (BENNING IT 120 B only)..............................................................45
5.10 TRUE RMS current (BENNING IT 120 B only)..............................................................46
5.11 Illumination (BENNING IT 120 B only)...........................................................................47
6 Working with measurement results (BENNING IT 120 B) ........................................49
6.1 Saving measurement results ........................................................................................ 49
6.2 Recalling measurement results..................................................................................... 50
6.3 Deleting measurement results...................................................................................... 51
7 RS232 and USB communication (BENNING IT 120 B only).....................................54
7.1 BENNING IT 120 B-PC software.................................................................................. 54
8 Maintenance.................................................................................................................56
8.1 Replacing fuses .............................................................................................................56
8.2 Cleaning.........................................................................................................................56
8.3 Periodic calibration.........................................................................................................56
8.4 Service...........................................................................................................................56
9 Technicalspecications..............................................................................................57
9.1 Insulation resistance......................................................................................................57
9.2 Resistance / continuity testing .......................................................................................57
9.2.1 LowΩresistancemeasurement .............................................................................57
9.2.2 Continuity...............................................................................................................57
9.3 RCD ...............................................................................................................................58
9.3.1 General data..........................................................................................................58
9.3.2 Contact voltage......................................................................................................58
9.3.3 Trip-out time...........................................................................................................59
9.3.4 Trip-out current ......................................................................................................59
9.4 Loop impedance and prospective short-circuit current..................................................60
9.5 Line impedance and prospective short-circuit current ...................................................61
9.6 Phase rotation (phase sequence)..................................................................................61
9.7 Voltage and frequency...................................................................................................61
9.8 Online voltage monitor...................................................................................................61
9.9 Resistance to earth....................................................................................................... 62
9.10 TRUE RMS current........................................................................................................62
9.11 Illumination.....................................................................................................................62
9.11.1 Illumination (BENNING Luxmeter type B)..............................................................62
9.12 General data ..................................................................................................................63

4
10 Appendix A Fuse base tables .....................................................................................64
10.1 Fuse base tables............................................................................................................65
11 Appendix B IT Systems........................................................................................................69
11.1 Applicable standards......................................................................................................69
11.2 Basic information ...........................................................................................................69
11.3 Measuring guidelines.....................................................................................................70
11.3.1 Voltage...................................................................................................................71
11.3.2 Line impedance......................................................................................................71
11.3.3 FI/RCD testing .......................................................................................................71
11.3.4 First fault leakage current (ISFL) ..........................................................................72
11.4 Technical data................................................................................................................73
11.4.1 First fault leakage current (ISFL) ...........................................................................73
12 Appendix C Power Supply Network with Lower Voltage..................................................74
12.1 Applicable standards......................................................................................................74
12.2 Basic information ...........................................................................................................74
12.3 Measuring guidelines.....................................................................................................74
12.3.1 Voltage...................................................................................................................75
12.3.2 FI/RCD testing .......................................................................................................75
12.3.3 Line resistance and prospective short-circuit current.............................................75
12.3.4 Loop resistance and prospective fault current.......................................................76
12.4 Technical data................................................................................................................76
12.4.1 FI/RCD Testing.......................................................................................................76
12.4.2 Loop resistance and prospective fault current.......................................................78
12.4.3 Line resistance and prospective short-circuit current.............................................79

5
1 Preface
Congratulations on your purchase of this BENNING instrument and its accessories. The develop-
ment of this instrument was based on long and rich experience.
BENNING IT 110/ BENNING 120 B is a professional, multifunctional, hand-held test instrument
intended for all measurements performed for total inspection of electrical installations in buildings.
The following measurements and tests can be performed:
- Voltage, frequency and phase rotation (phase sequence)
- Continuity(LowΩresistanceandcontinuityfunction)
- Insulation resistance
- RCD
- Loop impedance
- Line impedance
- TRUE RMS current (BENNING IT 120 B only)
- Resistance to earth (BENNING IT 120 B only)
- Illumination (BENNING IT 120 B only)
A large graphic matrix display with backlight offers easy to read results, indications, measurement
parameters and messages.
BENNING IT 110/ BENNING IT 120 B is equipped with all accessories necessary for comfortable
testing. It is kept in a soft carrying bag together with all accessories.

6
2 Safety and operational considerations
2.1 Warnings and notes
In order to reach high level of operator’s safety while carrying out various tests and measurements
using the BENNING instrument, as well as to keep the test equipment undamaged, it is necessary
to consider the following general warnings:
- The symbol at the BENNING IT 110/ BENNING IT 120 B means: “Read the Instruction ma-
nual with special care to safety operation”. The symbol requires an action!
- Ifthetestequipmentisusedinamannernotspeciedhere,theprotectionprovidedbythe
BENNING IT 110/ BENNING IT 120 B may be impaired.
- Read this user manual carefully, otherwise use of the BENNING IT 110/ BENNING IT 120 B
may be dangerous for the operator, for the instrument or for the equipment under test.
- Do not use the BENNING IT 110/ BENNING IT 120 B or accessories if any damage is noticed.
- If a fuse has blown, follow the instructions in the instruction manual to replace it.
- Consider all generally known precautions in order to avoid risk of electric shock while dealing
with hazardous voltages.
- Do not use the BENNING IT 110/ BENNING IT 120 B in supply systems with voltages higher
than 550 V.
- Service intervention or adjustment procedure is allowed to be carried out only by competent au-
thorised persons.
- Use only standard or optional test accessories supplied by your distributor.
- Consider that older and some of new optional test accessories compatible with this
BENNING IT 110/ BENNING IT 120 B meet only overvoltage category CAT III/ 300 V. It means
that maximal allowed voltage between test terminals and earth is 300 V.
- Disconnect any measuring accessory and power off the BENNING IT 110/ BENNING IT 120 B
before opening battery/fuse compartment cover, hazardous voltage inside.
Warnings concerning measuring functions
Insulating resistance
- Carry out measurements of the insulating resistance at discharged objects only!
- Disconnect all loads and close all switches for measuring the insulating resistance between
conductors of the system.
- Do not touch the object during the measurement or before it is completely discharged! Danger
of electric shock!
- When an insulation resistance measurement has been performed on a capacitive object auto-
matic discharge may not be done immediately. Warning message and actual voltage is dis-
played during discharge, until voltage drops below 10 V.
- Do not connect the test cables to an external voltage higher than 600 V (AC or DC), because
this might damage the tester!
Resistance/ continuity test
- Carry out the low-impedance measurement/ continuity test at discharged objects only!
- Thetestresultmightbeinuencedbyparallelimpedancesortransientcurrents.
Testing the PE connection
- If phase voltage is detected at the PE connection to be tested, immediately interrupt all measu-
rements and make sure that the error is corrected before going on with other work at the object!

7
Remarks concerning the measuring functions
General
- The symbol means that the selected measurement cannot be carried out due to irregular
conditions at the input terminal.
- Carry out measurements of insulating resistance, resistance/ continuity test and earth resis-
tance at discharged objects only!
- ThePASS/FAILindicationisactivatedwhenalimitingvaluehasbeendened.Choosealimi-
ting value which is appropriate for evaluating the measuring results.
- If only two of three cables are connected to the electrical system to be tested, only the voltage
indication between these two cables is valid.
Insulating resistance
- If the voltage between the testing terminals is higher than 10 V (AC or DC), the measurement
of the insulating resistance will not be carried out.
Resistance/ continuity Test
- If the voltage between the testing terminals is higher than 10 V, the resistance measurement/
continuity test cannot be carried out.
- Before carrying out the low-impedance measurement, the test cable resistance has to be com-
pensated (if necessary). This compensation is done by means of the LowΩ function.
Residual current protection (FI/RCD)
- Parameters set in this function are also kept for other RCD functions.
- The measurement of contact voltage in pre-test does not normally trip an RCD. However, the
triplimitmaybeexceededasaresultofleakagecurrentowingtothePEprotectiveconductor
or via a capacitive connection between L and PE conductors.
- Compared to the loop impedance RL(contact voltage subresult), the measurement of the loop
impedance Zsrcd offers increased accuracy.
- The tripping time and tripping current measurement is only carried out when the contact voltage
at nominal differential current is lower than the preset limiting value of the contact voltage.
- The autotest sequence stops when the trip-out time is outside the allowed time period.
Loop impedance
- L and N test terminals are reversed automatically if L/L1 and N/L2 test leads (universal test
cable) are connected in reversed way, or terminals of the tested wall plug are reversed, or plug
commander is turned around.
- Thespeciedaccuracyoftestedparametersisvalidonlyifthemainsvoltageisstableduring
the measurement.
- The low limit prospective short-circuit current value depends on fuse type, fuse current rating,
fuse trip-out time and IPSC scaling factor.
- Loop impedance (Zs) measurement trips an RCD.
- Measurement of the loop impedance (Zsrcd) does not normally trip an RCD. However, the trip
limitmaybeexceededasaresultofleakagecurrentowingtothePEprotectiveconductoror
via a capacitive connection between L and PE conductors.

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Line impedance
- The low limit prospective short-circuit current value depends on fuse type, fuse current rating,
fuse trip-out time and IPSC-scaling factor.
- Thespeciedaccuracyoftestedparametersisvalidonlyifthemainsvoltageisstableduring
the measurement.
Resistance to earth (BENNING IT 120 B only)
- If the voltage between the test terminals H and E is higher than 30 V the earth measurement
will not be performed.
- If a noise voltage higher than approx. 5 V is present between the H and E or S test terminals, a
warning symbol “ ”willbedisplayedinthemessageeld.Themeasurementresultsmaybe
affected!
TRUE RMS current (BENNING IT 120 B only)
- Only current clamps with a transformation ratio of 1000:1 should be connected. We recom-
mend to use the current clamp adapter BENNING CC 2 which can take measurements from
0.5 A - 20 A.
- An additional error of the connected current clamp has to be included into the measuring error!
Luminous intensity (BENNING IT 120 B only)
- Shadow and irregular incidence affect the measurement result!
- Pleaseobservethatarticiallightsourcesreachtheirfullcapacityafteracertaintimeonly.
For this reason, they should be switched on for the respective time before carrying out
measurements.
Testing the PE connection
- The PE terminal can only be tested when the function selector switch is set as follows: Zl/Ik
(LN/L); Zs/Ik (L/ PE); FI/ RCD TEST.
- For correct testing of the PE terminal, the TEST key has to be touched for a few seconds.
- Makesuretostandonanon-isolatedoorwhilecarryingoutthetest,otherwisethetestresult
may be wrong.
2.2 Batteries
- When battery cells have to be replaced or before opening the battery/fuse compart-
ment cover, disconnect any measuring accessory connected to the BENNING IT 110/
BENNING IT 120 B and power off the instrument. Hazardous voltage inside!
- Insert cells correctly, otherwise the BENNING IT 110/ BENNING IT 120 B will not operate and
the batteries could be discharged.
- If the BENNING IT 110/ BENNING IT 120 B is not used for a long period of time remove the
batteries from their compartment.
- Alkaline or rechargeable Ni-Cd or Ni-MH battery cells (size AA) can be used. The operating
hours are given for cells with a nominal capacity of 2100 mAh.
- Do not recharge alkaline battery cells, danger of explosion!

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2.3 Charging
The battery is charged whenever the power supply adapter is connected to the BENNING IT 110/
BENNING IT 120 B. In-built protection circuits control the charging procedure and assure maximal
batterylifetime.Powersupplysocketpolarityisshowningure2.1.
+
-
Abb. 2.1: Power supply socket polarity
Note:
- Use only the power supply adapter delivered by the manufacturer or distributor of the
BENNINGIT110/BENNINGIT120Btoavoidpossiblereorelectricshock.
2.4 Precautions on charging of new battery cells or cells unused for a longer
period
Unpredictable chemical processes can occur during charging of new battery cells or cells that
were unused for a longer period of time (more than 3 months). Ni-MH and Ni-Cd cells are affec-
ted to a various degree (sometimes called as memory effect).As a result the operation time of the
BENNINGIT110/BENNINGIT120Bcanbesignicantlyreducedattheinitialcharging/dischar-
ging cycles.
Therefore it is recommended:
- to completely charge the battery (at least 14h with in-built charger).
- to completely discharge the battery (can be performed with normal work with the instrument).
- to repeat the charge/discharge cycle for at least two times (four cycles are recommended).
When using external intelligent battery chargers one complete discharging/charging cycle is per-
formed automatically.
After performing this procedure a normal battery capacity is restored. The operation time of the
BENNINGIT110/BENNINGIT120Bnowmeetsthedatainthetechnicalspecications.
Note:
- The charger in the BENNING IT 110/ BENNING IT 120 B is a pack cell charger. This means
that the cells are connected in series during charging so all of them must be in a similar state
(similarly charged, same type and age).
- Even one deteriorated battery cell (or just of an another type) can cause an improper charging
oftheentirebatterypack(heatingofthebatterypack,signicantlydecreasedoperationtime).
- If no improvement is achieved after performing several charging/discharging cycles, the state of
individual battery cells should be determined (by comparing battery voltages, checking them in
a cell charger, etc). It is very likely that only some of the cells are deteriorated.
- The effects described above should not be mixed with normal battery capacity decrease over
time. All charging batteries lose some of their capacity when repeatedly charged/discharged.
The actual decrease of capacity versus number of charging cycles depends on the battery type
andisprovidedinthetechnicalspecicationfromthebatterymanufacturer.

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2.5 Standards applied
The BENNING IT 110/ BENNING IT 120 B is manufactured and tested in accordance with the fol-
lowing regulations:
- Safety requirements EN 61010-1:2001
- Electromagnetic compatibility
(emission and immunity to interference ) EN 61326:2002
- Electrical safety in low voltage distribution systems
Equipment for testing, measuring or monitoring
of protective measures
Measurements according to the European
Standard EN 61557:
General requirements Part 1
Insulation resistance Part 2
Loop resistance / loop impedance Part 3
Resistance of earth, PE and equipotential
bonding conductors Part 4
Resistance to earth Part 5
Residual current devices (RCD) in
TT and TN systems Part 6
Phase sequence Part 7
Combined measuring equipment Part 10
Illumination measurement according to standard DIN 5032 Part 7

11
3 Instrument description
3.1 Front panel
71
2
6
5
4
3
Fig. 3.1: Front panel, example: BENNING IT 120 B
Legend:
1ON/OFF key, to switch on or off the BENNING IT 110/ BENNING IT 120 B
The BENNING IT 110/ BENNING IT 120 B is automatically switched off 10 minutes after the
last key was pressed or the function selector switch rotated.
2Function selector switch.
3 BENNINGIT110: CALkey,tocompensatetestleadresistanceinlowΩresistance
measurement.
BENNING IT 120 B: Press MEM key to save, recall or delete measurement results.
4BENNING IT 110: HELP key, to access help menus.
BENNING IT 120 B: HELP/CAL key, to access the help menus. The CAL function is enabled in
lowΩresistancemeasurementtocompensatetestleadresistance.
5Jogger keypad with cursors and TEST keys
The TEST key also acts as the PE touching electrode.
6Key to change backlight level and contrast
High level backlight is automatically shut off 20 seconds after the last strike of any key or func-
tion selector switch rotation in order to extend the service life of the battery.
7128 x 64-dots matrix display with backlight

12
3.2 Connector panel
14
2
>550V
3
5
6
Fig. 3.2: Connector panel
Legend:
1Test connector
Warning:
Maximal allowed voltage between test terminals and earth is 600 V. Maximal allowed voltage
between test terminals is 550 V.
2Power supply socket
3Protection connector cover (prevents the simultaneous connection of test cable and charger)
BENNING IT 120 B only: In resistance to earth function test, the connector terminals are used
as follows:
- L/L1 black test lead is used for the auxiliary earth electrode (H).
- N/L2 blue test lead is used for the earth electrode (E).
- PE/L3 green test lead is used for the probe (S).
4RS 232 connector (BENNING IT 120 B only)
5USB connector (BENNING IT 120 B only)
6Current clamp input
3.3 Back panel
12
3
Fig. 3.3: Back Panel
Legend:
1Battery/fuse compartment cover
2Information label
3Fixing screws for battery/fuse compartment cover

13
Fig. 3.4: Battery and fuse compartment
Legend:
1Fuse F1
2Fuse F1
3Fuse F1
4Serial number label, a further serial number label is located outside next to the information label
5Battery cells (size AA)
6Battery holder
3.4 Bottom view
Fig. 3.5: Bottom view
Legend:
1Information label
2Neck belt openings
3Screw
4Serial number label with barcode

14
3.5 Carrying the BENNING IT 110/ BENNING IT 120 B
With the neck carrying belt supplied as standard, various possible ways of carrying the
BENNING IT 110/ BENNING IT 120 B are available. The BENNING IT 110/
BENNING IT 120 B is hung
around operator‘s neck only
- quick placing and
displacing.
The BENNING IT 110/ BENNING IT 120 B can
be used even placed in a soft carrying bag - the
test cable is connected to the instrument through
the front aperture.
3.6 BENNING IT 110/ BENNING IT 120 B set and accessories
3.6.1 Standard set
BENNING IT 110 BENNING IT 120 B
Instrument Soft carrying bag
Neck carrying belt, 2 pcs. Soft carrying bag Neck carrying belt, 2 pcs.
Measuring
accessories*) Universal test cable Tip commander
Schuko plug cable
Three test tips
3 alligator clips
Universal test cable
Tip commander
Schuko plug cable
Three test tips
3 alligator clips
Documentation Short instructions Short instructions
Batteries 6 Ni-MH rechargeable cells
Power supply adapter 6 Ni-MH rechargeable cells Power supply adapter
Cable RS232 cable
USB cable
CD-ROM Instruction manual
Short instructions Instruction manual Short instructions
BENNING PC-WIN IT 120 B Software

15
3.6.2 Optional accessories
BENNING IT 110 BENNING IT 120 B
Optional
accessories Current clamp adapter CC 2 (item no. TN 044110) LUXmeter probe, type B (item no. TN 044111)
Earthing set consisting of 2 earth rods and 3 test leads
(item no. TN 044113)

16
4 Operation of the BENNING IT 110/ BENNING IT 120 B
4.1 Meaning of symbols and messages on the display of the BENNING IT 110/
BENNING IT 120 B
The display is divided into four sections:
4
2
1
3
Fig. 4.1: Display outlook
Legend:
1Function and parameter line
In the top display line the measuring function/sub-function and parameters are displayed.
2 Messageeld
 Inthiseldbatterystatusandwarnings/messagesrelatedtotheactualmeasurementare
displayed.
3Online voltage and output monitor
4 Resulteld
 Inthiseldthemainandsub-resultstogetherwiththePASS/FAIL/ABORTstatusaredisplayed.
4.1.1 Online voltage and output terminal monitor
Online voltage is displayed together with test terminal
indication. All three test terminals are used for selected
measurement.
Online voltage is displayed together with test terminal
indication. L and N test terminals are used for selected
measurement.
Polarity of test voltage applied to the output terminals, L
and N.
Unknown supply system.
L–Npolaritychanged.
Frequency out of range.
4.1.2 Messageeld–batterystatus
Battery power indication.

17
Low battery indication. Battery pack is too weak to gua-
rantee correct result. Replace the batteries.
Charging is running (if power supply adapter is
connected).
4.1.3 Messageeld–measurementwarnings/messages
Warning! High voltage is applied to the test terminals.
Warning! Phase voltage on the PE terminal! Stop all the
measurements immediately and eliminate the fault before
proceeding with any activity.
Measurement is running. Consider any displayed
warnings.
Measurement can be performed after pressing the TEST
key. Consider any displayed warning after starting the
measurement.
Measurement prohibited! Consider any displayed war-
nings and check online voltage/terminal monitor.
TestleadresistanceinlowΩresistancemeasurementis
compensated.
RCD tripped during the measurement. The trip limit may
beexceededasaresultofleakagecurrentowingtothe
PE protective conductor or capacitive connection bet-
ween L and PE conductors.
RCD not tripped during the measurement.
BENNING IT 110/ BENNING IT 120 B overhea-
ted. The temperature of internal components in the
BENNING IT 110/ BENNING IT 120 B reached the top
limit. Measurement is prohibited until the temperature is
lower than that limit.
Battery capacity is too low to guarantee correct result.
Replace the batteries.
Fuse F1 (continuity circuit) blown or not inserted.
Single fault condition in IT system.
Noise voltage is present between H and E or S test
terminals.
Resistance of auxiliary earth electrode is too high.
Probe resistance is too high.

18
Resistance of auxiliary earth electrode and probe too
high.
4.1.4 Resulteld
Measurement passed.
Measurement failed.
Measurement is aborted. Check the conditions at the in-
put terminal.
4.1.5 Other messages
Instrument settings and measurement parameters/limits
are set to initial (factory) values. For more information re-
fer to chapter 4.5.4 Recalling original settings.
Probe LUXmeter probe is turned off or disconnected from the
instrument.
First measurement Therststoredmeasurementresultisdisplayed.
Last measurement The last stored measurement result is displayed.
Memory full All memory locations are occupied.
Already saved Measurement results already saved.
CHECK SUM ERROR Important memory contents lost or damaged. Contact
your distributor or manufacturer for further information.
4.1.6 Sound warnings
Shortest sound Pressed key deactivated.
Sub-function is not available.
Short sound
Pressed key activated.
Measurement has been started after pressing the
TEST key. Consider any displayed warnings during
measurement.
Long sound Measurement prohibited. Consider any displayed war-
nings and check online voltage/terminal monitor.
Periodic sound Warning! Phase voltage on the PE terminal! Stop all the measurements immediately and eliminate the fault before
proceeding with any activity.

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4.1.7 Function and parameter line

Fig. 4.2: Function selector switch and respective parameter line, example: BENNING IT 120 B
Legend:
1Main function name
2Function or sub-function name
3Measuring parameters and limit values
4.1.8 Selecting measurement function/ sub-function
The following measurements can be selected with the function selector switch:
- Voltage and frequency
- Insulation resistance
- Resistance / continuity testing
- RCD
- Loop impedance
- Line impedance
- Phase rotation (phase sequence)
- Resistance to earth (BENNING IT 120 B only)
- TRUE RMS current (BENNING IT 120 B only)
- Illumination (BENNING IT 120 B only)
The function/sub-function name is highlighted on the display by default.
The sub-function can be selected by using the and keys in the function/parameter line.
4.2 Setting measurement parameters and limits
By using the and keys select the parameter/limit value you want to edit. The selected para-
meter can be set by using the and keys.
Once the measurement parameters are set the settings are kept until new changes are made or
the original settings are recalled.
4.3 Help menu
Help menus are available in all functions. The Help menu contains schematic diagrams for illustra-
tion how to properly connect the BENNING IT 110/ BENNING IT 120 B to electric installation.After
selecting the measurement you want to perform, press the HELP key in order to view the respecti-
ve Help menu.
Press the HELP key again to see further Help screens if available or to return to the function
menu.

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Fig. 4.3: Example of help menu
4.4 Setup menu
In the Setup menu the following actions can be taken:
- Supply system selection
- Prospective short/fault current scaling factor adjustment
- Language selection
- Communication port settings
- Activating/ deactivating the COMMANDER (switchable probe tip)
To enter the Setup menu press the backlight key and rotate the function selector switch in any
direction at the same time.
Rotate function selector switch again to leave the Setup menu or setup sub-menus.
Fig. 4.4: Setup menu
4.4.1 Supply system setup
The BENNING IT 110/ BENNING IT 120 B enables tests and measurements in the following sup-
ply systems:
- TN (TT) system
- IT system
- Reduced low voltage system (2 x 55 V)
- Reduced low voltage system (3 x 63 V)
Select SYSTEMS in the Setup menu by using the and keys and press the TEST key to enter
the Supply system setup menu.
Fig. 4.5: Supply systems selecting menu
By using the and keys select the supply system and press the TEST key to accept the
setting.
4.4.2 Prospective short/fault current scaling factor adjustment
Select SET ISC FACTOR in the Setup menu by using the and keys and press the TEST key